Tire Size Box

225/65R14 vs 245/65R14

245/65R14 compared with 225/65R14

+4.0% diameter, +0.8" width

245/65R14 is 26.54" tall vs 25.52". More than the 3% rule of thumb, so check carefully before switching.

25.5"14" rim5.8"8.9" wide
225/65R14 (solid) compared with 245/65R14 (dashed outline), drawn to scale

With 245/65R14 tires, when your speedometer says 60 mph you are really going

62.4 mph

245/65R14 is +1.02 inches (+4.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/65R14245/65R14Difference%
Overall diameter25.52"26.54"+1.02"+4.0%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height5.76"6.27"+0.51"+8.9%
Circumference80.16"83.38"+3.22"+4.0%
Revolutions per mile790.4759.9−30.5−3.9%

Speedometer difference

If your vehicle came with 225/65R14 and you fit 245/65R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 225/65R14 or 245/65R14?
245/65R14 is taller by 1.02 inches (26.54" vs 25.52"). 245/65R14 is wider by 0.79 inches.
Can I replace 225/65R14 with 245/65R14?
It is not recommended without checking carefully. The diameter difference is +4.0%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 245/65R14 change my speedometer?
When your speedometer reads 60 mph with 245/65R14 fitted (calibrated for 225/65R14), your real speed is 62.4 mph. Your odometer will under-count miles by about 4.0%.
Will 245/65R14 lift my vehicle?
Ride height changes by half the diameter difference: +0.51 inches of ground clearance at the axle.

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